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Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Line Items]      
Valuation allowance $ 9,247,000 $ 8,373,000  
Unrecognized tax benefits, that would have impact on effective tax rate 5,800,000    
Interest and penalties related to unrecognized tax benefits 300,000 700,000 600,000
Interest and penalties accrued due to unrecognized tax benefits 2,600,000 2,300,000  
UNITED KINGDOM
     
Income Taxes [Line Items]      
Valuation allowance 6,200,000    
Hong Kong
     
Income Taxes [Line Items]      
Valuation allowance $ 3,000,000